One important life lesson that can be learned in chapter 18 is that happiness can only happen when you share it. Chris has realized that he misses his friends and family. Since he is in the wild, he can not enjoy his adventure and his time with other people. Happiness comes from being with people. That is where he realizes that he is most happy because he can talk about his adventures.
An important life lesson from chapter 15 is one should know their limitations and know what they are capable of achieving. This becomes a major factor to Chris and Krakauer. If Chris was more prepared and set more reasonable goals for himself, then he might still be alive. Also, if Krakauer would have accepted the fact that the trail he wanted to take to climb Devils Thumb was too dangerous, he would not have had to turn around and find another way. This would have saved him time. Everyone has dreams that they want to pursue in life. However, there is a better chance in reaching that dream if one takes more time to plan and take small steps, instead of one big step and being disappointed.
An important life lesson from chapter 15 is one should know their limitations and know what they are capable of achieving. This becomes a major factor to Chris and Krakauer. If Chris was more prepared and set more reasonable goals for himself, then he might still be alive. Also, if Krakauer would have accepted the fact that the trail he wanted to take to climb Devils Thumb was too dangerous, he would not have had to turn around and find another way. This would have saved him time. Everyone has dreams that they want to pursue in life. However, there is a better chance in reaching that dream if one takes more time to plan and take small steps, instead of one big step and being disappointed.